Steroidal dipyrimidines



United States Patent 3,198,790 STEROIDAL DIPYREMIDINES Pietro de Ruggieri, Carmelo Gandolfi, and Umberto Guzzi, Milan, Italy, assignors to Grmonoterapia Richter S.p.A., Milan, Italy, a corporation of Italy No Drawing. Fiied May 10, 1963, Ser. No. 279,626 Claims priority, application Italy, May 12, 1962, 9,514/62 12 Claims. (Ci. 260-2395) This invention relates to dipyrimidines incorporated into the androstane and estrane ring in the positions 3,2-d and 17,16-d, represented by the general formula:

wherein R is a member selected from the group consisting of hydrogen and methyl, while R and R are members selected from the group consisting of hydrogen and amino, and intermediates employed in their preparation. These compounds are very useful in therapeutics as antiandrogenic agents. These substances may be prepared by reacting such compounds as guanidine, formarnidine, trisformyl-amino-methane and dicyandiamide with fi-dicar- U bonyl-derivatives, the reaction being carried out first in position 2,3 and then in position 16,17 or vice versa, or even in positions 2,3 and 16,17 simultaneously.

The following examples are offered for illustrative purposes only, no limitation of the scope of the invention being intended.

EXAMPLE NO. 1

5 a-ana'rostane- [3,2-d] [I 7,16-d] -dipyrimidine 2.5 parts of 2,1 6-diformyl-5a-androstane-3,17-dione (copending US. application Serial No. 150,664, filed November 7, 1961), dissolved in 50 parts of formamide were mixed with 3.5 parts of tn's-formyl-arnino-methane and 0.15 part of p-toluenesulphonic'acid. After the mixture was kept at 160 C. for 8 hours, it was poured into 300 parts of normal sodium hydroxide and extracted with chloroform. The chloroform extract was washed with water until neutral, and concentrated and the recovered product was recrystallized from acetone. Yield: 1.27 parts of 5a-androstane-[3,2-d]-[17,I6-dJ-dipyrimidine; M.P. 217-219 C.; [a] =|-90 (benzyl alcohol).

EXAMPLE NO. 2

5u-estrane-[3,2-d]-[17,16-d]-dipyrimidine 1.3 parts of 2,16-diformyl-5a-estrane-3,17-dione (application Serial No. 150,664) were dissolved in 52 parts of formamide, and the solution was mixed with 5.2 parts of tris-formyl-amino-methane and 0.078 part of p-toluene sulphonic acid. The mixture was kept at 160 C. for 7 hours, and then poured into 200 parts of 1 N sodium hydroxide and extracted with chloroform. The chloroform extract was washed with water until neutral and evaporated to dryness, and the recovered product was recrystallized from acetone. Yield: 0.62 part of 5a-estrane- [3,2 -d] [17,16-d] -dipyrimidine; M.P. 212215 C.; [a] =+122 (pyridine).

Fatented Aug. 3, 1965 EXAMPLE NO. 3

[3,2-d] -2-amino-pyrimidine-5 a-androstane- [17,16-d1-pyrimidine A solution of 2 parts of 2-formyl-5a-androstane-3-one- [17,16-d]-pyrirnidine (copending application Serial N0. 215,243, filed August 6, 1962, now Patent No. 3,114,749) in 10 parts of ethanol was mixed with 10 parts of a solution of guanidine acetate in ethanol. The mixture was refluxed for 6 hours and then concentrated, and the product, collected by filtration, was recrystallized from methylene chloride-methanol. Yield: 1.2partsof [3,2-d] 2-aminopyrimidine-5 a-androstane-[ 17,16-d]-pyrirnidine; M.P. 300 C.;

U.V.: im,. 227, 255 and 313 my; e=16,300, 5,630, 5,140

7 7 EXAMPLE NO. 4 5 a-estrane-l 7-0ne- [3,2-d] -2'-amino-pyrimidine Three parts of 5u-estrane-17fi-ol-[3,2-d] 2'-aminopyrimidinewere dissolved in 5 parts of acetone and 65 parts of dimethylformarnide, and were oxidized at 0 C. with 6 parts of Jones reagent. At the end of ten minutes the excess oxidizer was decomposed with isopropyl alcohol, the mixture was neutralized, /3 of the solvent were distilled off under vacuum, and the residue was fully diluted with water. Yield: 2.2 parts of 5u-estrane-17- one-[3,2-d]-2'-amino-pyrimidine; M.P. 290 C.; I.R.: 1740, 1642, 1587, 1545 cm.

EXAMPLE NO. 5

EXAMPLE NO. 6

[1 7,16-d] -pyrimidine-Sa-estrane- [3,2-d] -2'-amin0- pyrimidine 1.27 parts of tris-formyl-amino-methane and 0.06 part of p-toluenesulfonic acid were added to a solution of 0.95

part of 16-f0rmyl-5a-estrane 17 one-[3,2-d]-2-arnino pyrimidine in 50. parts of formamide. The mixture was kept at 160 C. for 8 hours, and then poured into 200 parts of normal sodium hydroxide and extracted with ethyl acetate; the extract was washed with water until neutral and concentrated until it crystallized. Yield: 0.27 part of [17,16-d] -pyrimidine-5a-estrane-[3,2-d] -2-a mino pyrimidine; M.P. 290 C.;

U.V.: X 228, 255, 312 m e=l6,050, 5,570, 5,130 (methanol) EXAMPLE NO. 7

2a-cyano-5a-androstane-jJ 7-di0ne 2.5 parts of 2a-cyano-5a-androstane-17,6-ol-3-one dissolved in parts of acetone were oxidized with 6 parts of Jones reagent. At the end of ten minutes, the excess oxidizer was decomposed with isopropyl alcohol, the mixture concentrated under vacuum and diluted with water, and the product collected by filtration and recrystallized from methanol. Yield: 2.2 parts of 2a-cyano-5a-androstane-3,l7-dione; M.P. 224226 C.; [a] =+l35 (chloroform).

EXAMPLE NO. 8

2.2 parts of 2a-cyano-5a-androstane-3,17-dione were dissolved in 6 parts of pyridine and 3 parts of acetic anhydride, and the resulting solution was allowed to stand overnight at room temperature. It was then diluted with water, and the product was collected by filtration and recrystallized from methanol. Yield: 2.12 parts of 2 cyano-3-acetoxy-Sa-androst-Z-ene-17-one; M.P. 230-232 C.; I.R.: 2273, 1786, 1754, 1692 crnr EXAMPLE NO. 9

2wcyarz0-1 6-f0rmyl-5 a-ana' rstane-3,1 7-di0ne [3,2-d] -6-amin0-pyrimidine-5a-androslane- [17,16-d] pyrimidine Three parts of tris-formyl-amino-methane and 0.13 part of p-toluenesulphonic acid were added to a solution of 1.1 parts of Za-cyano-l6-formyl-5a-androstane-3,17- dione in 60 parts of formamide. After the mixture was kept at 160 C. for 8 hours, it was poured into 250 parts of 1 N sodium hydroxide and extracted with ethyl acetate. The extract was washed with water until neutral and evaporated to dryness. By chromatography on alumina,

from the ethyl acetate fractions, 0.2 part of Zea-cyanoa-androstane-3-one-[17,16-d] -pyrimidine was recovered; M.P. 290 C.; LR: 2198, 1695, 1623, 1563 cmr From the ethyl acetate-acetone (3:2) fractions 0.31 part of [3,2-d]-6'-aminopyrimidine-5a-androstane-[17,16-d1- pyrimidine was recovered; M.P. 290 C. [oc] =-}93 (benzyl alcohol); I.R.: 1640, 1586, 1560 cmr EXAMPLE NO. 11

[3,2-d] -2'6-diamino-pyrimidine-Sfiandrostane- [1 7,16-d] -pyrimidine 1.2 parts of dicyandiamide and 0.13 part of p-toluenesulphonic acid were added to a solution of 2.2 parts of 5oc-E1IldI'OStaI1-3-0H-[17,16-Cl] -pyrimidine (our patent application No. 215,243, U.S.A., filed August 6, 1962), in

wherein R is a member selected from the group consisting of hydrogen and methyl, and R and R are members selected from the group consisting of hydrogen and amino.

2. 5oc-androstane-[3,2-d]-[17,16-c1]-dipyrimidine.

3. 5a-estrane-[3,2-d]-[l7,l6-d]-dipyrimidine.

4. [3,2 d] 2 amino pyrimidine c androstane- [17,16-d]-pyrimidine.

5. 5a-estrane-17-one-[3,2-d]-2-amino-pyrimidine.

6. 16-formyl-5a estrane 17 one-[3,2-d]-2-aminopyrimidine.

7. [3,2-d]-2-amino pyrimidine-5ot-estrane-[l7,16-d]- pyrimidine.

8. 2-cyano-3-acetoxy-5u-androst-2-en -l7-one.

9. 2a-cyano-16-formyl-5a-an'drostane-3,l7-dione.

10. [3,2-d] 6 amino pyrimidine Sm-andfostane- [17, l 6-d] pyrimidine.

11. 2wcyano-5a-androstane 3 one-[17,16-d] -pyrimidine.

12. [3,2-d]-2,6'-diarnino-pyrimidine 5:: androstane- 17,16-d] -pyrimidine.

References Eited by the Examiner UNITED STATES PATENTS 2,999,092 9/61 Colton et a1 260-239.5

FOREIGN PATENTS 1,310,522 10/62 France.

LEWIS GOTTS, Primary Examiner. 

1. COMPOUNDS OF THE FORMULA: 